Multicomponent alloy composite anticorrosive coating for metal pipe/pipe fitting

A multi-element alloy and anti-corrosion coating technology, which is applied in the coating process of metal materials, pipeline anti-corrosion/rust protection, pipes/pipe joints/fittings, etc., can solve the problem of increased suspended particles, coating foaming, dizziness, nausea, Fever and other problems, achieve the effect of low porosity and excellent anti-corrosion performance

Inactive Publication Date: 2012-04-18
XINXING DUCTILE IRON PIPES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, the solubility of the corrosion products of the zinc layer is an important reason for the low corrosion resistance of the zinc coating. At the same time, the corrosion products can also cause the coating to blister and reduce the adhesion of the coating.
In addition, environmental pollution is the biggest problem facing thermal spray zinc
During the spraying process, the highly atomized metal ions and the ZnO dust generated by oxidation will cause serious pollution to the environment, increasing the number of suspended particles in the air
ZnO dust is highly toxic, a small amount of inhalation can cause dizziness, nausea, fever, and a large amount of inhalation can even cause death

Method used

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  • Multicomponent alloy composite anticorrosive coating for metal pipe/pipe fitting
  • Multicomponent alloy composite anticorrosive coating for metal pipe/pipe fitting
  • Multicomponent alloy composite anticorrosive coating for metal pipe/pipe fitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) Pipe surface treatment

[0054] Surface treatment of cast iron pipes and pipe fittings before thermal spraying to remove impurities such as oil, water, and dust.

[0055] (2) Arc spraying alloy coating

[0056] Arc thermal spraying equipment composed of high-power spraying power supply, spraying gun, wire feeding mechanism, air compressor, and control box is selected, and the weight of φ2.0mm is composed of Zn 56%; Al 41%; Mg 2.0%; RE 1.0% The multi-element alloy wire is used as the metal wire for arc thermal spraying, according to 130g / m 2 Spray on the surface of the pipeline to form a multi-element alloy composite anti-corrosion coating.

[0057] (3) Coating the sealing finish coating

[0058] Coating epoxy resin on the surface of the multi-component alloy layer to seal the alloy layer, the thickness of the final sealing layer is 110 μm.

[0059] figure 1 , figure 2 It is the SEM morphology analysis diagram of the surface structure and cross-section struct...

Embodiment 2

[0061] (1) Pipe surface treatment

[0062] Surface treatment of cast iron pipes and pipe fittings before thermal spraying to remove impurities such as oil, water, and dust.

[0063] (2) Arc spraying alloy coating

[0064] The electric arc thermal spraying equipment composed of high-power spraying power supply, spraying gun, wire feeding mechanism, air compressor and control box is selected, and the weight of φ4.0mm is composed of Zn 78%; Al 20%; Mg 1.5%; RE 0.5% The multi-element alloy wire is used as the metal wire for arc thermal spraying, according to 200g / m 2 Spray on the surface of the pipeline to form a multi-element alloy composite anti-corrosion coating.

[0065] (3) Coating the sealing finish coating

[0066] On the surface of the multi-component alloy layer, high-pressure airless spraying asphalt is used to seal the alloy layer, and the thickness of the sealing final layer is 100 μm.

[0067] image 3 It is the EDS analysis diagram of multi-element alloy composi...

Embodiment 3

[0069] (1) Pipe surface treatment

[0070] Surface treatment of cast iron pipes and pipe fittings before thermal spraying to remove impurities such as oil, water, and dust.

[0071] (2) Arc spraying alloy coating

[0072] Arc thermal spraying equipment composed of high-power spraying power supply, spraying gun, wire feeding mechanism, air compressor, and control box is selected, and the weight of φ3.0mm is composed of Zn 70%; Al 29.2%; Mg 0.75%; RE 0.05% The multi-component alloy wire is used as the metal wire for arc thermal spraying, according to 250g / m 2 Spray on the surface of the pipeline to form a multi-element alloy composite anti-corrosion coating.

[0073] (3) Coating the sealing finish coating

[0074] The surface of the multi-element alloy layer is coated with acrylic resin to seal the alloy layer, and the thickness of the final sealing layer is 130 μm.

[0075] Figure 4 It is a comparison chart of the electrochemical AC impedance spectrum of the multi-element...

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Abstract

The invention discloses a multicomponent alloy composite anticorrosive coating for a metal pipe / pipe fitting, which comprises a Zn-Al-Mg-RE multicomponent alloy layer and a hole-sealing finishing layer, wherein the hole-sealing finishing layer is coated on the surface of the Zn-Al-Mg-RE multicomponent alloy layer, the Zn-Al-Mg-RE multicomponent alloy layer comprises the following components by weight percentage: 56-83% of Zn, 16-41% of Al, 0.05-2.0% of Mg and 0.05-1.0% of Re, and the hole sealing finishing layer is an organic or inorganic coating layer. The multicomponent alloy composite anticorrosive coating disclosed by the invention has the advantages of low porosity, good anticorrosive property and the like.

Description

technical field [0001] The invention relates to an anti-corrosion coating, in particular to a multi-element alloy composite anti-corrosion coating for metal pipes and pipe fittings. Background technique [0002] Centrifugal ductile iron pipe is an ideal pipe material for urban water supply and gas pipe network. It has the advantages of high strength, good plasticity and strong corrosion resistance. It has the essence of iron and the performance of steel. It is a replacement product for traditional cast iron pipes and ordinary steel pipes. At present, the surface protective layer of centrifugal ductile iron pipe mainly adopts arc sprayed zinc layer. The main advantage of zinc coating is that it can play a cathodic protection effect on steel, and has a certain self-healing ability, which is mainly reflected in the following three aspects: 1) Zinc coating separates the corrosion medium of steel substrate and avoids their direct contact. 2) When the zinc coating exposes the ste...

Claims

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Application Information

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IPC IPC(8): F16L58/08C23C30/00C22C18/04
Inventor 李军宋延琦王恩清周波张永杰信绍广綦晓平
Owner XINXING DUCTILE IRON PIPES CO LTD
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